High level. Teacher Chen Wendeng's book "Core Questions of Postgraduate Mathematics" is a refined version of the review guide. The knowledge points in the book are summarized to the extreme. If you understand this book thoroughly, it is equivalent to a high level, and the math test 120 is not a problem. Chen Wendeng, a native of Longyan, Fujian, is a professor of mathematics and an expert in mathematics counseling for postgraduate entrance examination. 1966 graduated from the Department of Mathematics of Tianjin Nankai University and won the special contribution award in 2000.